Yield of tomato is limited by many diseases including Tomato spotted wilt virus disease. This study was conducted in the field at Kenya Agriculture Research Institute Njoro, Kenya, in 2004 and 2006 to determine the effect of intercropping on disease development, thrips population and yield of tomato variety Cal J grown under four intercrop systems involving kale, onion, maize and sole tomato. The experimental design was a Randomised Complete Block Design (RCBD) replicated three times. Disease scores on tomato-maize differed significantly from tomato-kale and tomato-onion in both years of the study. Maize cropping system had a low significant thrips population from the other cropping systems. Tomato-maize intercrop produced the lowest fruit weights and marketable yield in 2004 and 2006, while yield of onion, kale and maize in intercrops were not significantly different from their monocrops. Land equivalent ratio was >1 in all the cropping systems.
A gronomy J our n al • Volu me 102 , I s sue 2 • 2 010 363 ABSTRACT Stagnation in grain production in the developing world has contributed to the current worldwide food crisis. Th e principle objective of this study was to evaluate the possibility of improving grain production in the tropical humid region by chickpea (Cicer arietinum L.) in rotation with wheat (Triticum aestivum L). A 3-yr fi eld experiment in Kenya included four short-rainseason (SRS) management practices (chickpea green manure [GM], mature chickpea grain crop [CG], tilled fallow [TF], and weedy fallow [WF]), and inorganic N fertilizer at three rates (0, 30, and 60 kg N ha -1 ). Th e chickpea treatments decreased SRS water storage at wheat planting by 14 to 16% compared with TF, but this did not aff ect yield of subsequent wheat. Th e GM accumulated 77 kg N ha -1 yr -1 , compared with 42 kg N ha -1 yr -1 for the CG. Th e chickpea treatments increased soil available N by 19% and N uptake by wheat by 39% compared with the fallow methods. Inorganic N applications of 60 kg N ha -1 increased soil-available N at 30 d aft er sowing by 21.4% and N uptake by wheat by 47%. Th e CG and GM increased the average annual wheat grain yield by 14 and 31% compared with the WF and TF. Inorganic N applications of 30 and 60 kg N ha -1 increased wheat grain yield by 20 and 7%, respectively. Th e combination of GM with 30 kg N ha -1 gave the highest wheat grain yield, but CG with 30 kg N ha -1 fertilizer was the most profi table practice.
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